Sewing-machine



P. A HERB.

SEWING MACHINE.

APPLICATION FILED DEC. 31. 1915.

Patented Feb. 3, 1920.

3 SHEETS-SHEET l- WITNESSES.

P. A. HERR.

SEWING MACHINE.

APPLICATION FILED 050.31.1915

1,329,763. Patented Feb. 3,1920.

3 SHEETS-SHEET 2- o' a WITNESSES: 7 INVE/V 70/? I .J. MAFM 7 m FMiwwp/Q A T-TOR/VEY J40, Fla/W Q 7 BY P. A. HERB.

SEWING MACHINE. APPLICATION FILED DEC. 3!.1915.

1,329,763. Q Patented Feb. 3,1920.

3 SHEETS-SHEET 3.

INVENTOI? M ATTORNEY NTTE STATES PATENT OFFICE.

PARK A. HERB, OF SAYBROOK, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, GGBPOBATIQN OF NEW JERSEY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Feb. 3, 1920.

App1ication filed December 31, 1915. Serial No. 69,692.

To all whom it may concern Be it known that I, PARK A. HERB, a citizen of the United States, residing at Saybrook, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machines of that type in which the needle may be vibrated laterally to produce zigzag stitches, and it has for its object to provide an organized structure especially adapted for sewing heavy work, and capable of producing stitches extending transversely of the direction of feed or" a length of two and one-half inches or more.

In the embodiment of the invention herematter more fully described, the needle-bar is reciprocated in two vertically disposed sleeves slidingly mounted upon the overhanging arm of the machine and given bodily movements to laterally vibrate the needle-bar. The said sleeves receive their movements through connection with a rocker which also acts to impart bodily movements to a shuttle and means for accelerating the oscillation of the shuttle. The combined bodily movement and accelerated oscillatory movement or. the shuttle compensates "for the extreme lateral vibrations of V the needle, whereas the acceleration alone or, if desired, the bodily movement alone of the shuttle, be utilized to compensate for short lateral vibrations of the needle. To compensate for .the lateral throw of the needle toward the beak of the shuttle, in which case the shuttle thread in its cast-oil position will not lead in a straight line to the work, but will be turned back in the torn). ot a loop embracing the. dead limb oi"? the needle-loop which results in thesubsequcnt twisting oi the needle-loop about the shuttl ,-thread, the shuttle-driver is utilized as a pull-cit and positioning device for the slnittle-thread, and thus acts to insure the proper formation of the stitch.

In the accompanying drawings, Figures 1 and 2 are perspective views of a machine embodying the preferred form of my improvement, showing the mechanism for reciprocatingthe needle-bar and imparting to it lateral vibratory movements, Fig. 3 is a bottom plan view of the sewing machine bed with the mechanism for driving the shuttle in its raceway and imparting to its carrying frame reciprocating movements, Fig. 4 is a sectional elevation of the sewing machine bed illustrating more in detail the driving connections for the shuttle carrying frame, Fig. 5 is a detailed elevation of the shuttle and its racewayin extremelateral needle position; and F igs. 6, 7, 8 and 9 are detailed perspective views of the shuttle showing the method of forming stitches and 10 is a perspective view illustrating the action of the shuttle-thread pull-ofi'.

The improvements are embodied in a machine frame comprising the bed A to which is secured the standard B merging into the usual overhanging arm C provided with the head D. The main or driving shaft 1 of the machine extends lengthwise of the overhanging arm C and has secured thereon at one end the balance-Wheel 2 and grooved belt-pulley 8, while theopposite end of the shaft has fixed thereon the cam disk 4 which ,isutilized to impart reciprocatory motion to the needle-bar 5 and also to actuate the take-up 6. i

Parallel with the needle-bar 5 and journaled in the head I) is the press-bar 7 having fixed thereon at its lower end the split shank 8 of presser-foot 9 formed with the needle receiving slot 10. Suitable means are provided for regulating the pressure of the presser-foot 9 upon the work. In this instance the press bar ias clamped thereon at its upper end by means of the set-screws 11 a block 12 provided with the vertically extending spaced ears 13 supporting between them the cross-pin between which and the u ppeiwall of the block is fitted the forward end of a plate-spring 15 having its rearward end apertured to fit upon a stud-screw 16 provided with the adjusting nut 17 and stop-nut 18 whereby the said rearward end of the spring 15 may be raised or lowered Midway of'its length the spring 15 is received within the horizontal rectangular aperture 19 of a collar 19 formed with the depending spaced ears 20 apertured to receive a pin 21 serving to connect the collar with the upper end of a link 22, the lower end or" said link being connected by means Lil of a crank-stud 23 on the end of a rocksha'ft adapted to be manipulated by means of a lever to raise or lower the spring centrally of its length and thereby throw the pressure thereof upon the presser-bar or relieve the pressure of the spring and subsequently elevate the bar to move the presser-foot above the work, the said mechanism being similar to that shown and described in the patent to Charles M. Horton, No 1,279,112, issued. September 17 1918.

The neetlle-bar is fitted to reciprocate within the vertical sleeves 26, each sleeve being carried at the end of a short shai't'26 fitted to slide within apertures a, formed in the head D of the overhanging arm.

lamped upon the needle-bar inidwayoi' its length byinea' s of the set-screws s is a collar 27 havi fixed "hereon a block 28 fitted to slide with nth'e channel 29* of reciprocatory drivinginember operatively connected by means of the link 30 and crankstud 31 with cam disk l carried at the end of the driving shaft 1. To guide the driving member 29 in its movements, the latter is provided with a projecting rectangular lug '32 which slices w'thin the vertical slot 33 formed in the guide-arm 3d; secured by means of screws 35 upon the head I).

The means for imparting lateral vibratory movements to the needle-bar comprise the vertical rock-shaft 36 journalcd in the bosses 87 projectin from the overhangingarm n and carrying at its ends the crank arrns 38 connected by means of the upper link 39 and lower link 40 with the sleeves 26. The rockshaft 36 has clamped thereon at its upper end the sleeve ll of a crank-arm which receives motion by means of'link from a rock-arm 4st tulcrumed upon the stand ard B and actuated by, cam-wheel through the adjustable link it} and other connections now to be describe The cam-wheel 4-5 is lined upon the outer end of a short shaft 46* extending transversely ofthe overhanging arm C and journaled in suitable bearing bosses afforded by the latter. The cam-wheel is formed inte gral with the gear-wheel 45* driven by means of pinion 4-77 on the end of a short shaft 48 also ournaled transversely oi? the overhang ing arm G and operatively connected within the said arm by means of the spiral 49 and 50, with the main shaft 1. The camwieel 4:5 is a pattern cam formed with cam slot 51' ii the desired formation to act upona stud 52 carried by a segment lever 53 fulcrurned at 5% upon the overhanging arm C, and embraced by the clamping block pivotally connected at 56 with the link 46 and provided with the clamping screw-stud '57 which serves to securethe block in its adjusted position.

' said connections the needle-bar will be viby means of the feeddift roch'er (35 ha.

aser/es brat-ed laterally according to the character of the pattern cam and the adjustment between said cam and link 46 and that reciprocatory endwise movements will be imparted to the needle-bar from the main shaft by means or a cam disk l and link 30.

The toothed work-engaging portions of the feed-dog 58 project through apertures formed in the throat-plate 59, the dog being supported upon the feed bar frame 60 which receives reciprocatory feeding movements from feed-rocker 61 driven from the mainshaft by means of the eccentric G2, pitman 63-itl1Ll0lt11lC-RTH1 64, rising and falling movements being imparted to the feed-dog 'ng a rock-arm 65 connected to the lieedvbai nine and a crank-arm 66 formed as a yoke to em brace and receive motion from an eccentric 67 carried by the rock-shaft 68, the latter being journaled in the bearing bosses 69 and 70 depending from. the bed A, and be driven by crank e on the main-shad 1 through pitnian rocker 1, link 1, and crank-arm 68*.

The shuttle 71 is fitted to oscillate within the raceway 72, the latter carrying frame 73 mounted to slide upon the shaft 74: fixed within an aperture formed in bearing boss 70 and a second aperture formed in adepending portion A of the bed. Thesluittl'e is oscillated by means of the *driver 7 5 the latter being of the usual construction with an exception to be hereinafter set forth. The driver is carried upon the end of a short shaft 76 upon which is secured the gear-wheel 77 meshing with a second gear-wheel 77" carried at the end of a shaft 78 also journaled within the bearing boss 70 and provided with the wide pinion 79 meshing with pinion 80 at one end of a sliding sleeve 81. The sleeve 81 is slidingly mounted upona second sleeve 82 fixed upon a rock-shalt 6S and is formed with an inclinedslot entered by a stud a projecting from said'slee've 8 By means-of stud a 'the-sleeve81is caused to partake of the osit will be'coine necessary'to modify the action of the shuttle -'or bodilyinove the same in order that its beak'ma'y register with'the needle'eyein lts various positions.

' of the shuttle will As illustrated by Fig. 5 a vibration of the needle, in the present embodiment of the invention, within the points zu-m may be compensated forby acceleration of the shuttie, it being understood that when the needle is vibrated beyond the said points the beak v pass the needle below loop-seizingposition.

The sleeve 81 constitutes one of the primary members ofthe mechanism for accelerating and retarding the movement of the shuttle-beak, or, in other words, altering the amplitude of its operative movements to maintain its correct relation with the needle eye for seizure of needle-loops in the laterally spaced positions which the needle assumes during the formation of' zigzag stitches.

The means for imparting axial movements to the sleeve 81 are primarily those employed to impart lateral movements to the needle-bar. The rock-lever i l which receives motion from the cam-wheel is formed with a depending arm 44* which projects below the bed-plate and has pivotally connected thereto at 83 one end of a link 84, the opposite end of the link being connected to a crank-arm 85 secured upon one end of a short rock-shaft 86 journaled in a bearin boss 86 ro'ectin from the under face of the bed A, the said rock-shaft being provided with a second crank-arm 87 connected by means of link 88 with a yoke member 89 which embraces the reduced end of sleeve 81. It will be seen that the motion of rock-lever n in transmitting lateral movement to the needle-bar will, through link 84, rock-shaft 86 and link 88 transmit sliding movements to the sleeve 81 during the oscillation of the latter, thereby imparting an accelerated or retarded oscillation to shaft 78 according to the direction in which the sleeve 81 is axiall moved.

Means are provlded for bodily moving the shuttle simultaneously with the bodily lateral movements of the needle-bar, so that in relatively short lateral movements of the needle-bar either the shuttle acceleration means or the expedient of bodily moving the shuttle may be employed. The means for bodily moving the shuttle comprises the rockshaft S6, crank-arm 87 and a link 90 connecting the shuttle carrying. frame 73 with the crank-arm 87, so that as the rock shaft 86 transmits, by means of link 88, axial movement to the sleeve 81 to accelerate the shuttle beak, the said rock-shaft 86 will also transmit bodily movements to the shuttle-carrying frame.

\Vhenever it is desired to dispense with the acceleration of the shuttle and yet continue the bodily lateral movements thereof it is only necessary to disconnect the link 88 and connect the links 39 and 40 to the rockarms 38 at 2. Also when it is desired to dispense with the bodily lateral movements of the shuttle and continue the acceleration thereof it is only necessary to disconnect the link 90, and connect the links 39 and 40 as aforesaid.

Again referring to Fig. 5 it will be seen that when the needle is vibrated beyond the points ae-w, the acceleration of the shuttle alone will not enable its beak to properly register with the needle-loop, and that it will be necessary to bodily move the shuttle, especially when coarse thread is used in sewing heavy work, in which case it is necessary that the beak enter the loop at a point above the eye of the needle not less than 11;". Therefore by providing means for accelerating the movement of the shuttle and simultaneously imparting a bodily lateral movement to the shuttle, ample provision is made for the cooperation of the shuttle with the needle whatever may be the length of vibra' tion of the latter, and also the bodily movement of the shuttle is reduced to a minimum. In the relationship of the parts illustrated in the drawings, and particularly Fig. 5, the acceleration of the shuttle and the bodily movement thereof are of equal effect in insuring the cooperation of the shuttle beak and the needle when the latter is vibrated beyond'the points 50 m and with in the points g z When the needle moves to the left, or to ward the beak of the shuttle the effect in the formation of a stitch is the same as that obtained by reversing the feed in straightaway sewing, e. the thread in the cast-off position of the shuttle will not lead in a straight line to the work, but will be turned back in the form of a loop embracing the dead limb of the needle-loop, as illustrated in 6, the normal lead of the thread in the cast-off position being shown in Fig. 7. In such case when the take-up pulls upon the live limb of the needle-loop it will be turned by the abnormal lead of the shuttlethread and subsequently will. be twisted about the latter. The needle-loop in its first stage of movement under the action of the take-up will slip up the sliuttle thread to. the position a shown in dotted lines Fig. 8 until, at the said point, by its twist it grips the slnittle-thread with considerable frictional force, so that in the continued action of the take-up it will pull upon the shorter lead of the shuttle thread i. e. that extending in the direction of the previously formed stitch, and the result will be that illustrated in Fig. 9. To remedv the aforesaid defective action of the stitch-forming mechanism a shuttlethread engaging stud 91 is carried by the shuttle driver 75, so that in the reverseniove ment of the driver when the needle is moved laterally to its left hand position. Fig. 10, the stud will engage and pull off the thread from the shuttle until theslmttle-thread lies in the-position Z7 Fig. 10 which closely approximates the leadiof "the thread shown in Filgw la Having thus set forth the nature of the invention, what I claim herein is '1. In a sew'ing machine, in combination, stitch-forming mechanism includinga laterally vibrating needle and a circularly :movable loo-per, and means for impartingtosaid looper a combined bodily and accelerated-or retarded circular movement to insure the cooperationof thelooper-beak andneetlle in all lateral positions of the latter.

2. In a sewing machine, thecombination with stitch-forming mechanism including a laterally. vibrating needle and a looper, of means for imparting to the longer an Jaccelerated or retarded circular inovementand a lsoaibodilv movement of less degree than the lateral movementof the needle.

3; In a ewing machine, the combination with stitch-forming mechanism including a laterally.- vibrating needle and a 'looper, of means for imparting to the looper arombined bodil-vand accelerated or retardedcir cular movement, and {means adapted to permit the en'iployment of either the acceleration or the bodilymovementof the looper to insure its register with the needle within I a .field of vibration of "the latter.

4. In a sewing machine, the combination with stitch -forming mechanism including a laterally vibrating needle and a looper, of means impartin tothe loo-per an accelerated or retarded circular movement and also a bodilv movement of less degree-than the lateral movement-of the needle, and means; adapted to ad ust simultaneouslv'the vibratlon of theneedle and the accelerated and bodilvmovenient of the looper.

In aisewing machine, the-combination wit-ha frame, a-needle-har and-a needle carriedbythe latter, of spaced bodilv movable bearing :members within which the bar is mounted for reciprocation a proj ectingdriving-connection fixed upon the bar, a recip- "roca-tory driving-member formed with a groove to receive thesaid drivi'ngconnection, and means for alternately reciprocating the driving-memloer and laterally moving barlaterally.

7; ,In-Qa sewing machine, the combination with a ;.;frame and a. ineedlesbar mounted thereon for movement in transverse direc- .tions, an actuating shaft, means operatively connected with-said shaft forlaterall-y moving the needle-bar, a slide-block clamped uponthe barf, amovable arm formed with .al groovieto receive the slide-block, means for limiting the movement of the arm to the slot of the sleeve, driving means for the second shaft, and means including "the said rocker. for imparting axial movements to said sleeve.

'9. Ina sewing-maohiI1e,'the combination with a needle-bar andgmeans for imparting to the same reciprocatory movements in transversedirections,of a loop r, means for imparting a normal circular movement to the looper, means for accelerating orretardingtthe' normal circular movement of the looper, and connections driven'by the last named means :forfim-parting bodily. reciprocatory movements :to the looper;

1.0. In a-sewing machine, .the V combination with a needle-barandmeans for imparting to the same reciprocatory movementsin transverse directions, of a 'looper, a mova'bly sustained :frame in which the :looper is imonnted, a driving-shaft, a looper-actuating shaft, an. axially. movable, sleeve connected to one shaft andihaving a pin andinclined slot connection with theother Lshaft, a, rocker, an operative connection between ,the rocker and the looper frame, and xanioperativerconnection betweentherocker and the-sleeve.

11. In asew-ing machine,,the combination of a needle-bar. and means'forimparting to the, samemovements iii-transverse directions, of a shuttle, a shuttle-actuating shaft, a movable frame .in which'the. shuttle and actuating shaft are journaled, adrivingshaft geared to the shuttle actuating shaft, a rocker and a link connection between the rocker and the n1o'vable '.fram e.

l2. In alsewing machine, thelcombination with a, frame and a needle+bar mounted on the frame; for endwise and lateral-shifting movement, of a looper and' means :for circularly moving the same, a: rockerand a needle-bar shifting device connected therewith, a looper-shifting device and a looper accelerating device: each 'det achably 1 connected-with the rocker, and an adjustable connectionabetweenthe 1 needleb'ar, and its shifting device adapted to compensate for the detachment of either the looper shifting device or the looper accelerating device.

13. In a sewing machine, in combination, stitch-forming mechanism including a needle adapted to reciprocate in laterally spaced paths, a loop-taker having a loop-seizing beak and adapted to perform bodily lateral movements, means for laterally shifting said needle and loop-taker difl'erent distances in a given stitch-forming cycle, and means addltional thereto for maintaining in said stitch-forming cycle substantially normal 00- operative relation between the needle and loop-taker beak.

In testimony whereof I have signed my name to this specification.

PARK A. HERB. 

